Hi Wei, have you checked that the flirt transform is correct, and that the
input coords to the conversion are correct in voxel counts? Your syntax
does look correct I think....
Yes, your interpretation of the different data types is correct.
Cheers.
On Fri, 3 Sep 2004, Wei Qiu wrote:
> Hi Steve,
>
> Very sorry for the inconvenience and delay. Here is my questions:
>
> I modified avw2ascii.c to get a list of original coordinates of a highress
> template image (256*256*256). I am trying to convert all those coordinates
> to the MNI coordinates. By using the flirt, I had high2standard.mat, then
> apply
>
> img2talcoord -tal avg152T1_brain -img highress -xfm
> anat2standard.mat -flirt -vox orig_coors.txt > MNI_coords.txt
>
> The original list is:
> ------------
> 96 108 52
> 97 108 52
> 92 110 52
> 95 110 52
> 102 120 52
>
> Then Coordinates in Talairach volume (in mm):
> 31.4105 -33.8534 -88.1029
> 30.3458 -33.8707 -88.088
> 35.6874 -31.7767 -88.2138
> 32.4935 -31.8286 -88.1689
>
> However result is totally wrong as I know all these coordinates should
> be Amygdala.
>
> Meanwhile, I am not sure the difference of the following command.
> avw2ascii_64R 64 bit R?
> avw2ascii_8SI 8 bit, Signed int
> avw2ascii_32UI 32 bit Unsigned int
>
> If my approach is wrong, please point me. Have a nice weekend.
>
> Wei
>
Stephen M. Smith DPhil
Associate Director, FMRIB and Analysis Research Coordinator
Oxford University Centre for Functional MRI of the Brain
John Radcliffe Hospital, Headington, Oxford OX3 9DU, UK
+44 (0) 1865 222726 (fax 222717)
[log in to unmask] http://www.fmrib.ox.ac.uk/~steve
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